It's mum v mum as Serena makes Wimbledon last 16

Roger Federer won 37 of 40 first-serve points and stretched his Wimbledon winning streak to 29 sets in a 6-3, 7-5, 6-2 third-round victory over 64th-ranked Jan-Lennard Struff of Germany on Friday.

Federer, Djokovic and Nadal have been mostly immune to the chaos that's struck Wimbledon in the first two rounds; they've all survived so far. Rodina got to match point with a stunning forehand pass played nearly on her knees.

Serena Williams and seventh-seeded Czech Karolina Pliskova both won on Friday to avoid this year's surprising cull of favourites.

Rodina won nine games in a row to move a set and two breaks ahead before Keys recovered from 4-0 down in the second set to set up a decider.

For the first time in the Open era, fewer than four top 10 seeds have made the Wimbledon fourth round.

"I've gotten so good at playing the one match in front of me", said Keys of her progress in recent years.

Struggling to stay in the set after half an hour, Williams found her huge serve just in time to hang on for 4-5.

Only one former champion and one top 10 seed have made the fourth round of the women's singles at Wimbledon.

Williams and Evgeniya Rodina are the only remaining mothers of the six who had entered this event - and they will face each other in the fourth round Monday. "You have to win the last point, and I didn't succeed in that today".

After reaching the final a year ago and the semi-finals in 2016, Venus was expected to mount another strong challenge for the Wimbledon title.

"Serena is my idol", Rodina said.

Keys, who was the US Open runner-up past year, crashed out 7-5 5-7 6-4 to the Russian on a baking hot Court Three.

French Open semi-finalist Keys struggled for most of the match as she committed 48 unforced errors in a disappointing display.